Improvement in pumps



UNITED STATES PATENT OFFICE.

BENJAMIN S. HILL, OF NEW YORK, N. Y.,

IMPROVEMENT IN PUM PS.

Specification forming part of Letters Patent No. 48,1101, dated Juno 727, 1865.

, pump constructed according to my invention. Fig. 2 1s a horizontal section of the same in the plane indicated by the line or x in Fig. 1.

Similar letters ot reference indicate corresponding parts in the several igures.

This invention consists in an improvement whereby I obtain a double-acting pump with only two valves.

To enable otheis skilled in the art to construct a pump according to my invention, I will proceed to describe it with reference to `'the drawings.

A is the main cylinder ofthe pump, having an inlet-valve, B, at the bottom, abovewhere the suction-pipe is connected at ai.

P is the piston, containing a central valve, b.

p'lo this piston is connected an open-bottomed cylinder, O, of smaller diameter, which iits and works through a cylinder, D, which is screwed tightly onto and forms an air and water tight cover to the main cylinder A, and which closes the annular chamber E formed above the margin ot' the piston, between the main cylinder A` and the cylinder U. In the center of the cylinder C there is a pipe, F, the lower end of which is screwed tightly into a hole in the center of a diaphragm or transverse partition, c,

, provided in the cylinder C at some distance above the piston. A cap, G, is screwed onto the upper end otnthis pipe, to form by the aid of a packing-ring, d, of india-rubber or other material, an air-tight cover to the cylinder G, and the said cap, which has an opening right through it, has screwed into it the dischargepipe H, which also constitutes the rod for working the piston, the said discharge-pipe always communicating with theinterior ofthe piston by means ofthe pipe F. The annular space@ between the cylinder G and the pipe F is airtight, and the water perfectly excluded from it.

- Below the diaphragm or partition c there are openingsff in the cylinders C, which form a constant communication between the `piston and the reserve chamber E.

This pump may be used as a submerged or as alift and force pump. When a reoiprocatin g motion is given to the piston its action is as follows: In the downward stroke ot the piston the valve b opens andthe valve B closes, and. the water with which the cylinder has been previously tillcd below the piston rushes up throughthe piston, and a portion of it which is displaced by the cylinder C, passing through the passages f f, lls the chamber E, while the remainder passes up through the pipe F and is discharged through the discharge-pipeF. In the upward stroke ot" the pump the valve b is closed and B open, and while water comes up through the suction-pipe and follows up the piston the water with which the chamber E was tlled during the previous upward stroke is expelled from the said chamber through the passages f j', pipe F,'and discharge-pipe H. It will thus be seen that thel pump, though having but two valves, is double-acting, delivering water in the downward as well as in the upward stroke of the piston. In the upward stroke of the piston the air-tight chamber e forms a float to balance the weight ofthe discharge-pipe.

To provide for the draining ot' the pipe F and suction-pipe when desirable, one or more openings may be provided, as shown in dotted lines at g g in Fig. 1, in the cylinder-cap D, so that by raising the piston and cylinder C a little higher than they are raised in the operation ot the pump the upper parts of the openingsffmay be brought opposite to the above-mentioned openings g g, when the water from the pipes will run out through the latter openings.

WhatIclaim as my invention, and desire to secure by Letters` `Patent, is-

1. The cylinder having openings ff, combined with the piston P, and arranged in relation to the discharge-pipe H substantially as and for the purpose herein specilied.

2. Combining the discharge-pipe H with the piston by means ot' the cap Gr ot' the cyliuder C and the pipe F, the latter pipe serving also as a means of securing the cap G `tightly to the cylinder C and ot' forming an air-tight chamber, e, within the said cylinder, all substantially as herein specified.

3. The combination and arrangement of the piston'P, cylinder, C, chamber E, and discharge-pipe H, substantially as herein specified.

B'. S. HILL.

Witnesses J. W. OooMBs, G. W. REED. 

